BULLETIN 
TORREY BOTANICAL CLUB. 
The Genus Cephalozia in. North America. 
By Lucren M. UNDERWOOD, 
The Trigonantheae as outlined by Richard Spruce form a 
Somewhat natural group of the Jungermaniaceae. With us the 
Species are all foliose, but in certain neo-tropical genera the 
Sametophyte is reduced almost to the condition of protonema, 
Producing leaves only on the branches bearing the sex apparatus. 
In the Australasian genus Zoopsis, the simple thalloid shoot in some 
Species is provided with rudimentary leaves only, formed of one or 
two cells. The tribe, therefore, contains within itself, some of the 
Connecting links which ally the more usual forms to the simple 
Primitive hepatics. 
The tribe is characterized by the archegonia being borne on a 
Usually short ventral branch,* with a normally triangular perianth, 
So placed that the third or odd angle is ventral, the remaining two 
being lateral. The underleaves are usually wanting or small, only 
attaining the dignity of a third series of leaves in some of the 
Species of Lepidozia, though in Bazzania and Kantia they are well 
marked structures. The tribe contains some species that form con- 
Spicuous mats like Bazsania, but others are small, minute or even 
Microscopic in size. They inhabit old logs, or grow on the ground 
'n swamps, on clay banks or occasionally even in sand and on the 
faces of moss-covered rocks, but with us are rarely, if ever, found 
a Stect trees, where the species of Frullania, Lejeunea, Radula 
* Exceptions to this occur in some rare species of Cephalosia where they are 
: : terminal, 
